Tor - The Free Haven Project

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Early <strong>Tor</strong> versions used a trivialcentralized directory protocol.S1Trusted directorycacheAliceS2Trusted directorycacheAlice downloadsany signed listS3Servers publishself-signeddescriptors.Authoritiespublish signedlists of all descriptors42
We redesigned our directory protocolto reduce trust bottlenecks.S1EvilTrusted directorycacheAliceS2S3Servers publishself-signeddescriptors.Trusted directoryAuthoritiespublish signedstatements aboutdescriptors.cacheAlice downloadsall statements;believes themajority;downloadsdescriptors asneeded.(Also uses less bandwidth!)43
Page 1 and 2: Tor: AnonymousCommunications for th
Page 3 and 4: Informally: anonymity means youcan'
Page 5 and 6: We have to make some assumptionsabo
Page 7 and 8: Anonymity isn't steganography:Attac
Page 9 and 10: ...since “weak” anonymity... is
Page 11 and 12: Anonymity serves differentinterests
Page 13 and 14: Regular citizens don't want to bewa
Page 15 and 16: Law enforcement needs anonymityto g
Page 17 and 18: You can't get anonymity on your own
Page 19 and 20: Yes, bad people need anonymity too.
Page 21 and 22: IP addresses can be enough tobootst
Page 23 and 24: Low-latency systems are vulnerable
Page 25 and 26: The simplest designs use a singlere
Page 27 and 28: Add encryption to stop attackers wh
Page 29 and 30: So, add multiple relays so thatno s
Page 31 and 32: AliceA corrupt final hop can tell t
Page 33 and 34: Alice makes a session key with R1..
Page 35 and 36: Alice makes a session key with R1..
Page 37 and 38: Tor anonymizes TCP streams only:it
Page 39 and 40: Usability for server operators is k
Page 41: Server discovery is hard becausemis
Page 45 and 46: Tor implements responder anonymityw
Page 47 and 48: We're currently the largest stronga
Page 49 and 50: Bandwidth capacity is increasing.49
Page 51 and 52: Other common abuses●●●●●S
Page 53 and 54: Can we get a large number of semise
Page 55 and 56: University Tor servers● MIT, RPI,

Tor - The Free Haven Project

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